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Pu. 9. In Pelton wheel installation...
Pu. 9. In Pelton wheel installation a small auxiliary nozzle is often fitted, from which a jet of high pressure water can f the buckets, thus acting as a brake and bringing the wheel quickly to reset. Estimate the time required to stop the wheel by the brake nozzle under the following conditions: diameter of brake nozzle = 7 cm, head at the nozzle = 475 m, original velocity of the buckets = 45 m/s, corresponding kinetic energy of wheel and all revolving parts 15.2 * 100N.m.